This Java emulator requires Java enabled, available from here.
On loading of this page, if all is going well, you should see a 640x550 rectangle above this text. If you don't then Java is not working for you.
IMPORTANT! If the disc is double sided (DSD extension), then check the 'Double sided' box in the disk selection window. There is also a drop down box in this window to select the disk size per side, ensure it is set to 200k for SSD and DSD discs, 8BS has no other sizes for those formats.). Select 'OK' in this window and it will close.
IMPORTANT! Click within the emulator (the black area of this page) to ensure that the focus is in the emulator or it will not work.
Now see what you can do. Unfortunately, currently, a lot of machine code stuff fails, the 40 column teletext articles for instance, however, a lot does work. For those of you unfamiliar with BBC computers, to make the disc work, do SHIFT+BREAK (that is the BBC computer keyboard) usually SHIFT+F12 on the PC keyboard. F0 on the BBC keboard is usually F10 on the PC keyboard